6-hydroxy-pyrimidine-5-acetamides



United States Patent 3,296,261 G-HYDROXY-PYRIMIDINE-S-ACETAMIDES Richard A. Partyka, Syracuse, N.Y., assignor to Bristol- Myers Company, New York, N.Y., a corporation of Delaware No Drawing. Filed Mar. 9, 1965, Ser. No. 438,404 16 Claims. (Cl. 260-247.2)

This application is a continuation-in-part'of my prior, copendin-g application Serial No. 347,032, filed February 24, 1964, now abandoned.

This invention relates to novel antibody suppressants. More particularly, this invention relates to certain substituted-6hydroxypyrimidine5-N-substitnted acetamides.

Immunologic competence is responsible for specificity of host resistance to many environmental and physiological stresses. Antigen-anti-body reactions determine the specific response of the organism to a nonspecific challenge. For example, allergic, hypersensitivity responses to antigenic materials and to tissue transplant rejection result from such reactions. =Drugs which suppress antibody formation in animals, including man, are useful in helping to prevent the adverse effects caused by such reactions.

it is an object of this invention to provide a new class of therapeutic compounds. It is another object of this invention to provide novel compounds which are valuable antibody suppressants. It is a further object of this invention to provide novel compounds which are valuable intermediates in the preparation of other compounds which themselves possess therapeutic utility.

These objects have been attained by the practice of this invention, which, briefly, comprises providing a compound selected from the group consisting of compounds of the formula CHzC ONHR wherein R is (lower) alkyl, (lower) alkylthio or Ar in which Ar is a radical of the formula (lower) alkyl, (lower) alkoxy or trifloromethyl, R is (lower) alkyl or Ar, and R is (lower) alkyl, (lower) cycloalkyl containing from 3 to 8 carbon atoms inclusive as exemplified by cyclopropyl, cyclobutyl, cycloheptyl and cyclooctyl, (lower) alkenyl including allyl and methallyl, (lower) alkynyl including propargyl, di(lower) alkylamino(lower)alky1, piperidinoflower) alkyl, morp'holino (lower)alkyl, =N' (lower)alkylpiperazino(lower)alkyl, Ar or (CH -Ar wherein n is an integer from one to three inclusive; and the nontoxic, pharmaceutically acceptable acid addition salts thereof.

The new compounds are basic and are used per se as the base, especially when it is a crystalline solid at room temperature, and also in the form of addition salts of organic and inorganic acids such as hydrochloric, hydrobromic, hydriodic, sulfuric, nitric, phosphoric, acetic,

benzoic, ascorbic, citric, maleic, malic, tartaric, succinic, sulfamic, glycolic, cinnamic and mandelic acids. These salts are prepared by treating the free base with one equivalent of acid and are then isolated if desired, e.g. by lyophilization. The use of a salt is sometimes preferred to increase the aqueous solubility of the compound.

In the preferred embodiments of the present invention R R and R are each (lower) alkyl (but not necessarily alike) and preferably methyl. For use as intermediates to be cyclized, the preferred compounds are those in which R is (lower)alkylthio, R is (lower)alkyl or, preferably, hydrogen and R is (lower) alkyl, or, preferably, methyl.

The term (lower)alkyl as usedherein means both straight and branched chain, monovalent, aliphatic hydrocarbon radicals having from 1 to 6 carbon atoms inclusive, such as methyl, ethyl, propyl, isopropyl, isobutyl, t-butyl, hexyl, etc.

The compounds of this invention are valuable intermediates in the preparation of other compounds which themselves possess therapeutic utility. Thus, the compounds of this invention may be mixed with phosphorus oxychloride or phosphorus oxybromide and heated to form pyrrolo [2,3-d] pyrimidines having the formula N I RJ wherein R R and R are the same as described above and X represents chloro or bromo or, after catalytic dehalogenation, hydrogen. These substituted pyrrolo[2,3- d]pyrimidines exhibit hypotensive or analgesic activity. As illustrated in detail in the working examples-which follow, the compounds of the present invention are converted by reaction at elevated temperature with phosphorus oxychloride or phosphorus oxybromide or their equivalents to such pyrrolo[=2,3-d]pyrimidines in which X represents chloro or bromo and these in turn are converted to such compounds wherein X is hydrogen by catalytic dechlorination, as with palladium and hydrogen.

Moreover, some of the compounds of this invention are valuable antibody suppressants. Thus, they are effective in preventing the adverse effects caused by the reaction of antibodies and antigens and are therefore useful, for example, in preventing allergic reactions and in preventing the tende-ncy of an animal to reject foreign tissue transplants. Furthermore, some of the compounds of this invention possem other pharmacological uses such as antibacterial activity.

The compounds of this invention are prepared by reacting a compound having the formula R2 I Tomo 02m 111 OH wherein R and R are the same as described above, and R is hydrogen or (lower)alkyl with an amine having the formula R NH This reaction is accomplished byfirst preparing the mixed anhydride of the above acid (when R is hydrogen) by reacting the acid with equimolar amounts of triethylamine and ethylchloroformate or isobutyl chloroformate in acetonitrile, and subsequently reacting the mixed anhydride with the amine, preferably under a nitrogen atmosphere. Alternatively, the reaction is accomplished by the direct reaction of an alkyl ester of Patented Jan. 3, 1967 1y available or are known compounds or are readily synthesized as illustrated below or by methods known in the art as illustrated schematically thus:

R1 NH; 0

020 115 l (1. NZLOCH3) (2. Saponification) CHzC 02 2 5 wherein R R and R have the meaning set forth above and, in addition, R may be a sulfhydryl (SH) group which is converted (after cyclization to the pyrimidine),

to an alkylthio (SR) group by customary procedures such as reaction of the ester or final amide with sodium methoxide and an alkyl halide such as methyl iodide.

Thus, for example, ethyl 2-methyl-4-hydroxypyrimidine- S-acetate may be prepared according to the procedure described by Todd et al., J. Chem. Soc. 1601 (1936), and by the procedure described by Cerecedo et al., J. Amer. Chem. Soc., 59, 1714 (1937). Ethyl 2-ethylthio-4-hydroxypyrimidine-S-acetate may be prepared according to the procedure described by Johnson et al., Am. Chem. J. Ethyl 2-mercapto-4-methyl-6-hydroxy pyrimidine-S-acetate may be prepared by the procedures described by Andersag et al., Ber. 70, 2035 (1937). Ethyl Z-mercapto-4-hydroxypyrimidine-S-acetate may be prepared according to the procedure described by Johnson et al., J. Amer. Chem. Soc. 33, 758 (1911).

The following examples illustrate the best modes contemplated for carrying out this invention but are given for purposes of illustration only and not in limitation. All temperatures are given in degrees centigrade.

EXAMPLE 1 (a) 2,4-dimethyl-6-hydroxypyrimidine-5-acetic acid. To a solution of sodium methoxide (54.0 g.; 1.0 mole) in 650 ml. of absolute alcohol, there is added acetamidine hydrochloride (94.5 g.; 1.0 mole). An exothermic reaction occurs accompanied by the precipitation of NaCl. The mixture is stirred for 15 minutes and filtered slowly to remove the precipitated NaC-l. The filtrate is then added to a solution of sodium methoxide (54.0 g.; 1.0 mole) in 650 ml. of absolute alcohol. T 0 this mixture there is then added dropwise with stirring a solution of diethyl acetosuccinate (216 g.; 1.9 mole) in 200 ml. of absolute alcohol. After the addition is complete, the mixture is stirred for one hour at room temperature and then refluxed for twelve hours. The solvent is stripped oil under reduced pressure, and the residue is dissolved in a solution of sodium hydroxide (80.0 g.; 2.0 mole) in 500 ml. of water. After heating on a steam bath for 45 minutes, the solution is cooled and acidified to a pH of about 4 by the addition of HCl. A precipitate forms which is recovered by filtration. The product is washed with cold water and acetone and dried in vacuo over phosphorus pentoxide. The product, 2,4-dimethyl-6-hydroxypyrimidine-S-acetic acid (109 g.; 60% of theoretical yield), is found to have a melting point of 235-238 C. with decomposition. Recrystallization of 2,4-dimethyl- 4 6-hydroxypyrimidine-S-acetic acid from acetone-water afforded the analytical sample, M.P. 240-241".

Arzalysi.s.Calcd. for C H N O C, 52.74; H, 5.53; N, 15.38. Found: C, 52.69; H, 5.76; N, 15.33.

(b) 2,4-dimethyl-6-hydr0xypyrimidine-5-N-methylacetamide.To a stirred suspension of 2,4-dimethyl-6-hydroxypyrimidine-S-acetic acid (15.0 g.; 0.0825 mole) in 400 ml. of anhydrous acetonitrile, there is added triethylamine (11.5 ml.; 8.33 g.; 0.0825 mole). After solution is complete, the temperature is lowered to 10 C. and there is added ethylchloroformate (7.9 ml.; 9.0 g.; 0.83 mole) over a two-minute period. After stirring an addi: tional two minutes at -10 C., the cooling bath is removed and there is added a solution of 15 g. of methylamine in 50 ml. of dry tetrahydrofuran. This addition is performed under a nitrogen atmosphere. A white precipitate is immediately formed. The mixture is stirred vigorously and allowed to warm to room temperature over a 1.5-hour period. The product, 2,4-dimethyl-6-hydroxypyrimidine-S-N-methylacetamide, is collected by filtration, dried and recrystallized from ethanol. The product (10.7 g.; 66.5% of theoretical yield) is found to have a melting point of 272-275 C.

Analysis.Calcd. for C H N O C, 55.37; H, 6.71; N, 21.53. Found: C, 55.30; H, 6.70; N, 21.60.

This compound is useful as an antibody suppressant.

(0) 2,4,7 trimethyl 6 chloropyrrolo[2,3-d1pyrimidine.A solution of 5.46 g. (0.028 mole) 2,4-dimethyl- 6-hydroxypyrimidine-S-N-methylacetamide and ml. of phosphorus oxychloride was refluxed for one hour and worked up as described in Example 6. Evaporative dis tillation of the crude material at -170/0.04 mm. atforded 2.94 g. (53.7%) of 2,4,7-trimethyl-6-chloropyrrolo[2,3-d]pyrimidine, M.P. 77-79.5 C. with softening at 64 C.

Analysis.Calcd. for C H N Cl: C, 55.25; H, 5.15; N, 21.48; Cl, 18.12. Found: C, 55.40; H, 5.22; N, 21.55; C1, 18.40.

(d) 2,4,7-trimethylpyrrolo[2,3-d]pyrimidine hydrocloride.-A solution of 5.0 g. (0.0256 mole) 2,4-dimethyl- 6-hydroxypyrimidine-5-N-methylacetamide and 150 ml. phosphorus oxychloride was refluxed for one hour and worked up as described in Example 6. The crude 2,4,7 trimethyl-6-chloropyrrolo[2,3-d]pyrimidine was dissolved in 100 ml. ethanol to which was added 3.58 ml. (0.0256 mole, 2.9 g.) triethylamine and 500 mg. 10% palladium on carbon. After hydrogenation on the Parr apparatus and filtration through Super-Cel (diatomaceous earth), the ethanol was removed and aqueous sodium bicarbonate was added. After several extractions with benzene, the combined extracts were washed with brine, dried and rendered free of solvent. To the crude 2,4,7-trimethylpyrrolo[2,3-d]pyrimidine was added 200 ml. of dry ether. While efficiently cooled, gaseous hydrochloric acid was passed through the solution for three minutes. The product was filtered, dried and recrystallized from absolute alcohol. In this manner, there was obtained 3.48 g. (68.9%) of recrystallized 2,4,7-trimethylpyrrolo- [2,3-d]pyrimidine hydrochloride, M.P. 277-281 (d.).

Analysis.Calcd. for C H N Cl: C, 54.68; H, 6.12; N, 21.26; Cl, 17.94. Found: C, 54.75; H, 6.23; N, 21.40; Cl, 17.95.

A sample of 2,4,7-trimethylpyrrolo[2,3-d] pyrimidine was evaporatively distilled at 60/0.4 mm. The analy tical sample had a M.P. 45-48.

Analysis.Calcd. for C H N C, 67.05; H, 6.88; N, 26.07. Found: C, 67.20; H, 6.83; N, 26.22.

EXAMPLE 2 (a) 2,4 dimethyl-6-hydr0xypyrimidine-5-N-cycl0pr0- pylacetamide.The mixed anhydride of 2,4-dimethyl-6- hydroxypyrimidine-S-acetic acid (11.0 g.; 0.0605 mole) is prepared in the same manner as described in Example 1b using 6.1 g. of triethylamine (0.0605 mole; 8.5 ml.) and 6.6 g. of ethylchloroformate (0.0605 mole; 5.8 ml.).

The mixture is stirred for two minutes and there is then added cyclopropy-lamine (3.5 g.; 0.0615 mole) in 40 ml. of tetrahydrofuran accompanied by a flow of nitrogen. The mixture is then stirred vigorously for 30 minutes and the resultant precipitate is collected by filtration and thoroughly dried. The product, 2,4-dimethyl-6-hydroxypyrimidine-5N-cyclopropylacetamide (8.39 g.; 62.7% of theoretical yield) is found to have a melting point of 272- 274 C. with decomposition.

Analysis.Calcd. for C H N O C, 59.71; H, 6.83; N, 18.99. Found: C, 59.65; H, 6.95; N, 19.00.

(b) 2,4 dimethyl 7 cyclopropylpyrrlo[2,3- d] pyrimidine hydrachl0ride.-A solution of 4.0 g. (0.0181 mole) of 2,4-dimethyl-6-hydroxypyrimidine-5N-cyclopropylacetamide and 700 m1. phosphorus oxychloride was refluxed for 50 minutes and worked up as described in Example 6b. The crude 2,4-dimethyl-6 chloro-7-cyclopropylpyrrolo [2,3-d] pyrimidine was dissolved in 100 ml. ethanol to which was added 2.5 ml. (0.0181 mole, 1.81 g.) triethylamine and 100 mg. of 10% palladium on carbon. Hydrogenation and workup was carried out as described in Example 1d. Preparation of the hydrochloride as described in Example 1d afforded 3.21 g. (79.2%) of crude 2,4 dimethyl 7-cyclopropylpyrrolo [2,3-d] pyrimidine hydrochloride, which when recrystallized from ethanol-ether gave an M.P. of 231240 (d.) with slow decomposition from 196.

Analysis.-Calcd. for C H N Cl: C, 59.06; H, 6.31; N, 18.78; Cl, 15.85. Found: C, 59.00; H, 6.54; N, 18.85; Cl, 15.70.

EXAMPLE 3 (a) 2,4 dimethyl 6 hydroxypyrimidine 5 N- benzylacemmide.The mixed anhydride of 2,4-dimethyl- 6-hydroxypyrimidine-5acetic acid (5.5 g.; 0.03 mole) is prepared as described in Example 1b using 3.3 g. of ethylchloroformate (0.03 mole; 2.9 ml.) and 3.1 g. of triethylamine (0.03 mole; 4.3 ml.). The mixture is stirred for two minutesat C. and then the cooling bath is removed. There is then added, accompanied by a strong flow of nitrogen, a solution of benzylamine (3.2 g.; 0.03 mole) in 25 ml. of dry tetrahydrofuran. Precipitation of the product begins immediately. The reaction mixture is stirred vigorously for 45 minutes and 300 ml. of water are then added. The precipitated product is collected by filtration, washed with water and dried. The product, 2,4 dimethyl 6 hydroxypyrimidine 5 N benzylacetamide (6.0 g.; 74.1% of theoretical yield), is obtained in a high degree of purity. The sample is recrystallized from a mixture of isopropyl alcohol and water and is found to have a melting point of 276-278" C. with darkening at 275 C.

Analysis.C-alcd. for C H N O C, 66.40; H, 6.32; N, 15.49. Found: C, 66.60; H, 6.35; N, 15.78.

(b) 2,4 dimethyl 7 benzylpyrr0lo[2,3 d] pyrimidine hydr0chloride.A solution of 8.5 g. (0.0314 mole) of 2,4- dimethyl 6 hydroxypyrimidine 5 N benzylacetamide in 100 ml. phosphorus oxychloride was refluxed for one hour and worked up as described in Example 6b, except that methylene chloride was used as the extraction solvent. The crude 2,4dimethyl-6-chloro-7benzylpyrrolo [2,3-d]pyrimidine was dissolved in 200 ml. ethanol to which was added 3.95 ml. (0.0314 mole, 2.86 g.) of triethylamine and 400 mg. of 10% palladium on carbon. The hydrogenation and its workup was carried out as described in Example 11!. Preparation of the hydrochloride was carried out as described in Example 1d. Recrystallization from isopropyl alcohol aflorded 6.0 g. (70.0%) of 2,4-dimethyl-7-benzylpyrrolo[2,3-d]pyrimidine hydrochloride, M.P. 225-230" (d.).

Analysis.Calcd. for C H N Cl: C, 65.81; H, 5.89; N, 15.35; Cl, 12.95. Found: C, 65.90; H, 6.07; N, 15.35; Cl, 12.95.

EXAMPLE 4 (a) 2,4 dimethyl 6 hydroxypyrimidine 5 N (fiphenylethyl)acetamide.--The mixed anhydride of 2,4-

6 dimethyl-6-hydroxypyrimidine5-acetic acid (9.1 g.; 0.05 mole) is prepared as described in Example 1b using 5.05

g. of triethylamine (0.05 mole; 7.0 ml.) and 6.83 g. of

isobutyl chloroformate (0.05 mole; 6.6 ml.). The mixture is stirred for two minutes at 9 C. and there is then added a solution of B-phenylethylamine (6.06 g.; 0.05 mole) in 50 ml. of dry tetrahydrofuran. The cooling bath is then removed and the reaction mixture is stirred vigorously for one hour. The precipitated product is collected by filtration, dried and recrystallized from a mixture of ethanol and water. The product, 2,4-dimethyl-6-hydroxypyrimidine-S-N-(fi-phenylethyl) acetamide 10.0 g.; 70.4% of theoretical yield), is found to have a melting point of 258261 C.

Analysis.-Calcd. for C H N O C, 67.34; H, 6.71; N, 14.73. Found: C, 67.20; H, 6.67; N, 15.00.

(b) 2,4 dimethyl 7 (,8 phenylethyl)pyrr0lo[2,3- d] pyrimidine hydrochloride. A solution of 5.0 g. (0.0176 mole) of 2,4-dimethyl-6-hydroxypyrimidine-5-N- (B-phenylethyhacetamide in ml. phosphorus oxychloride was refluxed for two hours and worked up as decribed in Example 6b. The crude 2,4-dimethyl-6 chloro-7- (fl-phenylethyl)pyrrolo[2,3-d]pyrimidine was subjected to hydrogenation as described in Example 1d. Formation of the hydrochloride as described in Example 1d afiorded 4.5 g. of crude 2,4-dimethyl-7-(fi-phenylethynpyrrolo[2, 3-d] pyrimidine hydrochloride. Recrystallization from isopropanol, ethyl acetate-ethanol, or water affords a material the NMR and IR spectra of which indicate the presence of solvent of recrystallization along with the desired product.

EXAMPLE 5 (a) 2,4 dimethyl 6 hydroxypyrimidine 5-N-[B-(I- morpholino)ethyl]acetamide.The mixed anhydride of 2,4-dimethyl-6-hydroxypyrimidine-S-acetic acid (5 .5 g.; 0.0302 mole) is prepared as described in Example lb using 3.05 g. of triethylamine (0.0302 mole; 4.23 ml.) and 4.14 g. of isobutyl chloroformate (0.0302 mole; 3.98 ml.). The mixture is stirred for two minutes at 8 C. and there is then added a solution of N-(fi-aminoethyl) morpholine (4.0 g.; 0.0308 mole) in 30 ml. of tetrahydrofuran accompanied by a strong flow of nitrogen. The cooling bath is then removed and the mixture is stirred vigorously for one hour. The resultant precipitate is collected by filtration, tho-roughly washed with dry methylene chloride to leach out the triethylamine hydrochloride, and dried. The product, 2,4-dimethyl-6-hydroxypyrimidine-5- N-[fi-(l-rnorpholino)ethyl]acetamide (7.22 g.; 81.4% of theoretical yield), is recrystallized from a mixture of ethanol and water. The recrystallized product is found to have a melting point of 252255 C. with decomposition.

Analysis.-Calcd. for C H N O C, 57.12; H, 7.53; N, 19.04. Found: C, 57.25; H, 7.56; N, 19.15.

(b)2,4-dimethyl 7 [B-(lmorpholin0)ethyl]pyrr0l0[2, 3-d] pyrimidine dihydr0chl0ride.A solution of 3.0 g. (0.0102 mole) of 2,4-dimethyl-6-hydroxypyrimidine-5-N- [,8-(1-morpholino)ethyl]acetamide in 100 m1. phosphorus oxychloride was refluxed for one hour and worked up as described in Example 6b. The crude 2,4-dimethyl-6- chloro 7 [;3(1-morpholino)ethyl] pyrrolo[2,3-d]pyrimidine was subjected to hydrogenation as described in Example ld. Subsequent workup and preparation of the dihydrochlo-ride was carried out as described in Example Id. In this manner, there was obtained after recrystallization from ethanol-ether, 2.17 g. (64.7%) of 2,4-dimethy1-7- [B- (1 morpholine)ethyl]pyrrolo[2,3-d] pyrimidine dihydrochloride, M.P. 280290 (d.).

Analysis.-Calcd. for C H N OCl C, 50.46; H, 6.66; N, 16.81; Cl. 21.27. Found: C, 50.70; H, 6.80; N, 16.80; Cl. 21.55.

EXAMPLE 6 (a) 2 methyl hydroxypyrimidine-5-N-methylacetamide.To 350 ml. of ethanol containing approximately 60 g. of methylamine, there is added ethyl 2-methyl-4-hydroxypyrimidine-S-acetate (11.7 g.; 0.0596 mole). The resulting clear solution is allowed to stand at room temperature for eight days under anhydrous conditions. Subsequently, the excess methylamine is driven off by heating on a steam bath and the remaining solvent is removed under reduced pressure. The white solid residue is recrystallized from absolute alcohol. The product, 2- methyl 4-hydroxypyrimidine-S-N-methylacetamide (10.0 g.; 92.6% of theoretical yield), is found to have a melting point of 215217 C.

Analysis.Calcd. for C H N O C, 53.03; H, 6.12; N, 23.19. Found: C, 53.00; H, 5.96; N, 23.15.

(b) 2,7 dimethyl-6-chloropyrrol0[2,3-d]pyrimidine.- A solution of 42.8 g. (0.236 mole) 2-met-hyl-4-hydroxypyrimidine-5-N-methylacetamide and 500 ml. phosphorus oxychloride was heated at reflux for one hour. Excess phosphorus oxychloride was removed under reduced pressure and the residue poured over ammonium hydroxideice water layered with benzene-ether. When hydrolysis was complete and the aqueous layer remained basic, the organic layer was separated and the aqueous layer washed twice with benzene. The combined organic extracts were washed with brine, dried over sodium sulfate and filtered. Removal of solvent afforded 37.2 g. (88.9%) of solid 2,7- dimethyl 6 chloropyrrolo[2,3-d]pyrimidine. A small sample was sublimed for analysis, M.P. 104-106 Analysis.Calcd. for C H N Cl: C, 52.90; H, 4.44; N, 23.14; Cl, 19.52. Found: C, 53.10; H, 4.42; N, 23.05; Cl, 19.70.

(c) 2,7-dimethylpyrrolo[2,3-d]pyrimidine.To a solution of 2.1 g. (0.012 mole) 2,7-dimethyl-6-chloropyrrolo [2,3-d]pyrimidine and 1.21 g. (0.012 mole, 1.67 ml.) triethylamine in 100 ml. ethanol was added 1.0 g. 5% palladium on carbon. Theoretical uptake of hydrogen was complete in five minutes on the Parr apparatus. After filtration through Super-Cel and removal of the ethanol, the residue was washed thoroughly with bemene and filtered by gravity. Removal of the benzene from the filtrate aiforded 1.3 g. (73.6%) of crude 2,7-dimethylpyrrolo[2,3-d]pyrimidine which was sublimed at 75 /0.1 mm., M.P. 65-68" with softening at 63.

Analysis.Calcd. for C H N C, 65.28; H, 6.16; N, 28.55. Found: C, 65.25; H, 5.97; N, 28.60.

EXAMPLE 7 (a) 2 methylthio-4-methyl-fi-hydr0xypyrimidine-5-N- methylacetamide.-To a solution of 4.26 g. (0.02 mole) 2 mercapto 4-methyl-6-hydroxypyrimidine-S-N-methylacetamide and 1.08 g. (0.02 mole) sodium methoxide in 30 ml. methanol was added 12 ml. of methyl iodide. After about five minutes a heavy precipitate deposited which necessitated the addition of more methanol to facilitate stirring. After 45 minutes, the reaction mixture was cooled and filtered. Recrystallization from water-ethanol afiorded 3.0 g. (66.1%) of 2-methylthio-4-methyl-6-l1ydroxypyrirnidine S-N-methylacetamide, M.P. 266269 (d.).

Analysis.Calcd. for C H N O S: C, 4.5; H, 5.76; N, 13.49; 5, 14.11. Found: c, 47.70; H, 5.77; N, 18.42; s, 14.35.

(b) Z-methylthi-4,7-dimethyl-6-chl0r0pyrr0l0[2,3-d] pyrimidine.A solution of 5.0 g. (0.022 mole) 2-rnethylthio 4 methyl 6 hydroxypyrimidine N methylacetamide in 100 ml. phosphorus oxychloride was refluxed cfor one hour and worked up as described in Example 6b. Recrystallization of the evaporatively distilled material from isopropyl alcohol afforded 2.92 g. (58.2%) of 2-met-hylthio-4,7-dimethyl 6 chloropyrrolo 2,3 d]pyrimidine, M.P. 76-77".

Analysis. Calcd. for C H N SC-l: C, 47.46; H, 4.43; N, 18.45; S, 14.08; Cl, 15.57. Found: C, 47.68; H, 4.61; N, 18.57; S, 14.19; Cl, 15.79.

EXAMPLE 8 (a) Ethyl 2-phenyl-4-hydroxypyrimidine-5-acetate. A solution of 108.0 g. (0.90 mole) benzamidine in ethanol was prepared by the addition of 140.4 g.' (0.90 mole) benzamidine hydrochloride to 900 ml. ethanol containing 20.7 g. (0.90 mole) dissolved sodium. After stirring for ten minutes the solution was filtered from the precipitated sodium chloride. To this solution of benzamidine in ethanol was added with adequate stirring, a solution of 179.5 g. (0.90 mole) diethyl formylsuccinate in ml. ethanol. After refluxing cfor 18 hours, the reaction mixture was cooled and the product filtered by suction. In this manner, there was obtained, g. (54%) of, ethyl 2-phenyl-4-hydroxypyrimidine-S-acetate, M.P. 169- 175.

Analysis.-Calcd. for C H N O C, 65.10; H, 5.46; N, 10.85. Found: C, 65.00; H, 5.51; N, 10.88.

(b) 2 phenyl-4-hydroxypyrimidine-S-NmethyIaCetamide.A mixture of ethyl 2-phenyl-4-hydroxypyrimidine- 5-acetate (20.0 g.; 0.0776 mole) in 250 ml. of ethanol is combined with a solution of 10 g. of methylamine, in 250 ml. of ethanol. The mixture is allowed to stand at room temperature for four days. Subsequently, the solvent is removed by evaporation, the residue is thoroughly dried and is recrystallized from a mixture of dimethyl formarnide and water. The product, 2-phenyl-4- hydroxypyrimidine-S-N-methylacetamide 10.1 g.; 53.4% of theoretical yield), is found to have a melting point of 3'l0315 C. with browning at 305 C.

Analysis.Calcd. for C H N O C, 64.18; H, 5.39; N, 17.28. Found: C, 64.20; H, 5.42; N, 17.35.

(c) 2-phenyl-7-methylpyrrolo[2,3-d] pyrimidine-A solution of 9. g. (0.039 mole) 2-phenyl-4-hydroxypyrirnidine-S-N-methylacetainide in 200 ml. of phosphorus oxychloride was refluxed for one hour and worked up as described in Example 6b. The crude 2-phenyl-6-chloro-7- methylpyrrolo[2,3-d]pyrimidine was dissolved in a solution of ml. ethanol and 50 ml. benzene. After the addition of 6.5 ml. (0.0465 mole, 4.7 g.) of triethylamine and 1.5 g. 10% palladium on carbon, hydrogena-.

tion was carried out on the Parr apparatus. The product was worked up in the manner described in Example 1d. Recrystallization of the crude material from dry Skellysolve B afforded 2.9 g. (35.6%) of 2-phenyl-7- methylpyrrolo[2,3-d]pyrimidine. Evaporative distillation at 1201130/ 0.05 mm. afforded an analytical sample, M.P. 81-83 with softening at 77.

Analysis.C-alcd. for C H N C, 74.62; H, 5.30; N, 20.08. Found: C, 74.80; H, 5.36; N, 19.91.

EXAMPLE 9 (a) 2,4-dimethyl-6-hydroxpyrimidine-S-N-t-butylacetamide.-T he mixed anhydride of 2,4-dimethyl-6-hydroxypyrimidine-S-acetic acid (5.5 g.; 0.03 mole) is prepared and subsequently reacted with t-butylamine (2.2 g.; 0.03 mole) in 20 ml. of tetrahydrofuran, all as described in Example 1b. After the product precipitates, it is EXAMPLE 10 (a) 2-mercapto 4-hydroxypyrimidine 5 N methylacetamide.To a mixture .of ethyl 2-mercapto-4-hydroxypyrimidine-S-acetate (5.7 g.; 0.0266 mole) in 100 ml. of

methanol, there is added a solution of 6.2 g. of methyl-' amine in 150 ml. of methanol. The mixture is processed as described in Example 13a to obtain 2-mercapto-4-hydroxypyrimidine-S-N-methylacetamide (4.3 g.; 81% of theoretical yield). This product is recrystallized from a mixture of water and dimethyl formarnide. The recrystallized product is determined to. have a melting point of 310-315 C. with decomposition. v

The recrystallized product is Analysis.-Calcd. for C H N O S: C, 42.19; H, 4.55; N, 21.09; S, 16.09. Found: C, 42.00; H, 4.61; N, 21.25; S, 16.20.

(b) 2 ethylthio 4 hydroxypyrimidine-S-N-methylace.tamide.--To a saturated solution of methylamine in 300 ml. of methanol, there is added a slurry of ethyl 2- ethylthio-4-hydroxypyrimidine-5-acetate (30.0 g.; 0.124 mole) in 100 ml. of methanol. The mixture is swirled and complete solution results. This solution is allowed to stand at room temperature for five days. Excess methylamine is then removed by heating the solution on the steam bath, and the remaining solvent is removed under reduced pressure. The residue is slurried in about 150 ml. of cold water and the mixture is carefully acidified by the addition of concentrated HCl. The precipitated solid is collected by filtration, dried and recrystallized from 95% alcohol. The product, 2-ethylthio-4- hydroxypyrimidine-S-N-methylacetamide (17.6 g.; 62.6% of theoretical yield), is found to have'a melting point of 203-2065 C.

Analysis.-Calcd. for C H N O S: C, 47.55; H, 5.76; N, 18.49; S, 14.11. Found: C, 47.30; H, 5.68; N, 18.78; S, 14.10.

(c) 2 ethylthio 6 chloro 7 methylpyrrl0[2, 3-d]pyrimidine.A solution of 16.77 g. (0.0738 mole) of 2 ethylthio 4 hydroxypyrimidine 5 N methylacetamide and 160 ml. of phosphorus oxychloride was refluxed for 45 minutes and worked up as described in Example 6b. There was realized 15.6 g. (92.8%) of crude 2-ethylthio-6-chloro-7-methylpyrrolo [2,3-d]pyrimidine. Recrystallization from isopropyl alcohol followed by evaporative distillation at 130/0.05 mm. afiorded a sample for analysis, M.P. 80-82".

Analysis.-Calcd. for C H N SCl: C, 47.46; H, 4.43;

N, 18.45; S, 14.08; Cl, 15.57. Found: C, 47.60; H, 4.52; N, 17.20; S, 14.52; Cl, 15.90.

(d) 2 ethylthio 7 methylpyrrol0[2,3-d] pyrimidine hydrochloride.--A solution of 5.0 g. (0.022 mole) of 2- ethylthio 6 chloro 7 methylpyrrolo[2,3-d1pyrimidine in 200 ml. ethanol was charged with 2.2 g. (0.022 mole; 3.08 ml.) of triethylamine and 3.0 g. of 30% palladium on diatomaceous earth. Hydrogenation was carried out on the Parr apparatus. An additional gram of catalyst was introduced after one hour. After a total of two hours, the reaction mixture was worked up as in Example 1d. There was obtained 4.12 g. (96.8%) of crude Z-ethylthio-7-methylpyrrolo[2,3-d] pyrimidine, the hydrochloride of which was prepared as described in Example ld. There was realized 4.33 g. (85.6%) of crude 2 ethylthio 7 methylpyrrolo[2,3-d]pyrimidine hydrochloride which when recrystallized from isopropyl alcohol gave an M.P. of 201206 (d.) with browning at 195.

Analysis.Calcd. for C H N SCl: C, 47.05; H, 5.27; N, 18.29; Cl, 15.43; S, 13.96. Found: C, 47.15; H, 5.35; N, 18.05;S, 13.88; Cl, 15.35.

EXAMPLE 11 (a) 2 methylthio 4 hydroxypyrimidine 5 N- methylacetamide.-A solution of 5.0 g. (0.0252 mole) 2 mercapto 4 hydroxypyrimidine 5 N methylacetamide, 1.43 g. (0.0252 mole) sodium methoxide, and 30 ml. methyl iodide was stirred at room temperature for two hours. After removal of the solvent, acetone was added to the residue and the resultant slurry digested slightly on the steam bath. Filtration and thorough washing with'acetone afforded 2.5 g. (46.6%) of 2- methylthio 4 hydroxypyrimidine 5 N methylacetamide. Recrystallization from ethanol afforded the analytical sample, M.P. 213216.

Analysis.-Calcd. for C H N O S: C, 45.05; H, 5.20; N, 19.71; S, 15.03. Found: C, 45.32; H, 5.49; N, 19.64; S, 14.87.

(b) 2 methylthio 7 methyl 6 chlorapyrr0l0[2, 3-d]pyrimidine hydrochloride. A solution of 5.0 g.

10 (0.0234 mole) 2 methylthio 6 hydroxypyrimidine- S-N-methylacetamide in 100 ml. phosphorus oxychloride was refluxed for one hour and worked up as described in Example 6b. A hydrochloride salt was prepared in the usual manner which after recrystallization from ethanol-ether afforded 3.71 g. (63.4%) of 2-methylthio-7- methyl 6 chloropyrrolo[2,3-d]pyrimidine hydrochloride, M.P. 183-188".

Analysis.Calcd. for CgHgNgSCl'HCI: C, 38.41; H, 3.63; S, 12.81; Cl, 28.35. Found: C, 38.58; H, 3.76; S, 12.96; Cl, 28.56.

EXAMPLE 12 (a) 2 methyl 4 hydroxypyrimidine 5 N phenylacetamide. A mixture of ethyl 2-methyl-4-hydroxypyrimidine-S-acetate (10.0 g.; 0.051 mole), aniline (4.6 g.; 0.051 mole) and sodium methoxide (6.0 g.; 0.1 mole) in ml. of dry benzene is refluxed for 24 hours. The mixture is then cooled, and the benzene is decanted. There are then added 25 ml. of water and the mixture is acidified by the addition of 5% HCl. The mixture is then cooled and the precipitate is collected by filtration, washed with water, dried and recrystallized from a mixture of dimethyl formamide and water. The product, 2-

methyl 4 hydroxypyrimidine 5 N phenylacetamide (8.0 g.; 66.6% of theoretical yield), is found to have a melting point of 235-237 C. with softening at 226 C.

Analysis.Calcd. for C H N O C, 64.18; H, 5.39; N, 17.28. Found: C, 65.00; H, 5.52; N, 17.55.

(17) 2-methyl-7-phenylpyrrol0[2,3-d] pyrimidine hydrochloride.A solution of 4.0 g. (0.0165 mole) of Z-methyl-4-hydroxypyrimidine-5-N-phenylacetamide in 130 ml. phosphorus oxychloride was refluxed for 1.5 hours and worked up as described in Example 6b. The crude 2- methyl 6 chloro-7-phenylpyrrolo[2,3-d]pyrimidine was subjected to hydrogenation as described in Example 1d. Preparation of the hydrochloride as described in Example 1d afforded 2.25 g. (55.6%) of 2-methyl-7-phenylpyrrolo[2,3-d]pyrimidine hydrochloride recrystallized from ethanol, M.P. 255-264 (d.) with browning at 248.

Analysis.Calcd. for C H N Cl: C, 63.54; H, 4.93; N, 17.10; Cl, 14.43. Found: C, 63.50; H, 4.93; N, 17.00; Cl, 14.37.

EXAMPLE 13 (a) 2 mercapto 4 methyl-6-hydr0xypyrimidine-S-N- methylacetamide.-T0 a mixture of ethyl 2-mercapto-4' methyl-G-hydroxypyrimidine-S-acetate (35.0 g.; 0.153 mole) in 200 ml. of methanol, there is added a solution of g. of methylamine in 250 ml. of methanol. The mixture is allowed to stand at room temperature for five days, after which most of the solvent is removed by evaporation. The residue is cooled, collected by filtration and dried. A white crystalline solid is thus obtained which is slurried in 200 ml. of water. The slurry is then rendered acidic by the addition of acetic acid. A thick precipitate is formed which is collected by filtration, washed with Water and acetone and dried. The product, 2-mercapto-4-methyl-6-hydroxypyrimidine 5 N-methyL acetamide (28.8 g.; 88.1% of theoretical yield), is found to have a melting point of 299-303" C. with decomposition.

Analysis.-Calcd. for C H N O S: C, 45.05; H, 5.20; N, 19.71; S, 15.03. Found: C, 44.95; H, 5.07; N, 19.85; S, 15.03.

(b) 2 ethylthio 4 methyl-6-hydr0xypyrimidine-S-N- methylacetamide.Preparation of the mixed anhydride of 10.0 g. (0.044 mole) 2-ethylthio-4-methyl-6-hydroxypyrimidine-S-acetic acid, prepared according to the procedure of Johnson and Heyl, addition of the methylamine, and subsequent workup was carried out essentially as described in Example 1b, except that tetrahydrofuran was used as the solvent. The crude material was dissolved in ca. 75 ml. water and acidified to pH 6.5 with hydro- 1 1 chloric acid. The precipitate so obtained was collected and dried. In this manner, there was obtained 5.5 g. (51.9% of 2-ethylthio-4-methyl-6-hydroxypyrlmidine-5- N-methylacetamide. Recrystallization from water afforded the analytical sample, M.P. 243-245 with sweating at 238.

(c) 2 ethylthio 4,7 dimethyl-6-chloropyrrol0 [2,3-d] pyrimidine hydrchl0ride.A solution of 5.0 g. (0.0208 mole) 2 ethylthio 4 methyl-6-hydroxypyrimidine-5-N- methylacetamide in 100 ml. phosphorus oxychloride was refluxed for one hour and worked up as described in Example 6b. A hydrochloride salt was prepared in the usual manner and recrystallized from ethanol-ether. In this manner, there was obtained 4.2 g. (72.7%) of 2- ethylthio 4,7 dimethyl 6 chloropyrrolo [2,3-d]pyrimidine hydrochloride, M.P. 179.5 to 185.

Analysis.Calcd. for C H N SCl-HCl: C, 43.17; H, 4.71; N, 15.10; Cl, 25.49; S, 11.53. Found: C, 43.00; H, 4.73; N, 15.32; Cl, 25.38; S, 11.54.

EXAMPLE 14 (a) 2,4 dimethyl-6-hydroxypyrimidine-5-N-propargylacetamide.Preparation of the mixed anhydride of 9.1 g. (0.05 mole) 2,4-dimethyl-6-hydroxypyrimidine-S-acetic acid, addition of 2.8 g. (0.051 mole) monopropargylamine, and subsequent workup was carried out essentially as described in Example 1b. Recrystallization .from 95% alcohol-water afforded 5.89 g. (53.8% of 2,4-dimethyl- 6-hydroXypyrimidine-5-N-propargylacetamide, M.P. 257- 258 (d.).

Analysis.Calcd. for C H N O C, 60.26; H, 5.98; N, 19.15. Found: C, 60.40; H, 5.97; N, 19.32.

(b) 2,4-dimethyl 6 chl0r0-7-pr0pargylpyrrolo[2,3-d] pyrimidine hydrochl0ride.--A solution of 5.0 g. (0.028 mole) 2,4-dirnethyl-6-hydroxypyrirnidine-5-N-propargylacetamide in 100 ml. phosphorus oxychloride was refluxed for one hour and worked up as described in Example 6b. In this manner, there was obtained 2.0 g. (32.5%) of the free base, 2,4-dimethyl-6-chloro-7-propargylpyrrolo [2,3-d1pyrirnidine, M.P. 125-129". The hydrochloride salt, 2,4 dimethyl 6 chloro-7-propargylpyrrolo[2,3-d] pyrimidine hydrochloride, was prepared in the usual manner and recrystallized from ethanol-ether, M.P. 249- 1 with browning from 210".

Analysis.Calcd. for C H N Clz C, 60.15; H, 4.59; N, 19.13. Found: C, 60.27; H, 4.72; N, 19.22.

Analysis.-Calcd. for C H N Cl-HC1: C, 51.58; H, 4.33; N, 16.41; Cl, 27.68. Found: C, 51.68; H, 4.41; N, 16.32; Cl, 27.53.

EXAMPLE 15 (a) 2,4 dimethyl 6 hydroxypyrimidine 5 N (2- diethylaminoethyl)acetamide.Preparation of the mixed anhydride of 11.0 g. (0.0604 mole) 2,4-dimethyl-6- hydroxypyrimidine-5-acetic acid, addition of 7.0 g. (0.0604 mole) of Z-diethylaminoethylamine, and subsequent workup was carried out essentially as described in Example 1b. In this manner, there was obtained 7.0 g. (59.8%) of 2,4-dimethyl-6-hydroxypyrimidine-5-N- (2-diethylaminoethyl)acetamide. Recrystallization from acetonitrile aflorded the analytical sample, M.P. 165-166.

Analysis.Calcd. for C H N O C, 59.97; H, 8.63; N, 19.99. Found: C, 59.98; H, 8.48; N, 19.97.

(b) 2,4-dimethyl-7-(2 diethylaminaethyl) 6-chl0r0- pyrr0l0[2,3-d] pyrimidine dihydr0chl0ride.-A solution of 3.0 g. (0.0107 mole) 2,4-dimethyl-6-hydroxypyrimidine- 5-N-(2-diethylaminoethyl)acetamide in 35 ml. phosphorus oxychloride was refluxed for one hour and worked up as described in Example 6b. The dihydrochloride salt was prepared in the usual manner which after recrystallization from ethanol-ether aflorded 2.0 g. (52.8%) of 2,4-dimethyl-7-(2 diethylaminoethyl) 6 chloropyrrolo [2,3-d]pyrimidine dihydrochloride, M.P. 247250 (d.).

Analysis.-Calcd. for C H N Cl-2HCl: C, 47.53; H, 6.55. Found: C, 47.48; H, 6.53.

(c) 2,4 dimethyl 7 (2 diethylaminoethyl)pyrrolo [2,3-d] pyrimidine dihydrochloride.A solution of 3.5 g. (0.0125 mole) 2,4-dimethyl-6-hydroxypyrimidine-5-N- (Z-diethylaminoethyl)acetamide in 40 ml. phosphorus oxychloride was refluxed for one hour. Subsequent manipulations were carried out in a manner analogous to Example 6b. In this manner, there was obtained 2.84 g. (71.2%) of 2,4-dimethyl-7-(Z-diethylaminoethyl) pyrrolo[2,3 d] pyrimidine dihydrochloride. Recrystallization from ethanol-ether aflorded the analytical sample, M.P. 251-254 (d.).

Analysis.Calcd. for C H N -2HCl: C, 52.66; H, 7.58; N, 17.55; Cl, 22.21. Found: C, 52.86; H, 7.76; N, 17.31; Cl, 22.21.

EXAMPLE 16 (a) 2,4dimethyl-6-hydr0xypyrimidine 5-N-isopr0pylacetamide.Preparation of the mixed anhydride of 5.0 g. (0.027 mole) 2,4-dimethyl-6-hydroxypyrimidine-5-acetic acid using isobutyl chloroformate, addition of 1.67 g. (0.028 mole) isopropylamine, and subsequent workup was carried out essentially as described in Example 1b. Recrystallization from dimethylformamide atforded 4.0 g. (66.6%) of 2,4-dimethyl-6-hydroxypyrimidine-S-N-isopr-opylacetamide, M.P. 277-280 (d.).

Analysis.Calcd. for C11H17N302: C, 59.17; H, 7.68; N, 18.82. Found: C, 58.90; H, 7.47; N, 19.02.

(b) 2,4 dimethyl 7 isopropylpyrrol0[2,3-d]pyrimidine hydr0chl0ride.A solution of 5.0 g. (0.0224 mole) 2,4-dirnethyl 6-hydroxypyrimidine 5 N-isopropylacetamide in ml. phosphorus oxychloride was refluxed for one hour. Subsequent manipulations were carried out in a manner analogous to Example 6b. In this manner, there was obtained 3.68 g. (72.7%) of 2,4-dimethyl7 isopropylpyrrolo[2,3 -d]pyrirnidine hydrochloride. Recrystallization from methyl isobutyl ketone followed by sublimation at -110/ 0.05 mm. afforded the analytical sample, M.P. 218-221 (d.).

Analysis.-Calcd. for C H N -HCl: C, 58.53; H; 7.15; N, 18.62; Cl, 15.70. Found: C, 58.80; H, 7.16; N, 18.82; Cl, 15.80.

EXAMPLE 17 (a) 2,4-dimethyl 6 hydroxypyrimidine 5 N-cyclopentylacetamide.-Preparation of the mixed anhydride of 9.1 g. (0.05 mole), 2,4-dimethyl-6-hydroxypyrlmjdine- S-acetic acid, addition of 4.7 g. (0.055 mole) cyclopentylamine, and subsequent workup was carried out essentially as described in Example 1b. Recrystallization from dimethylformamide atforded 8.2 g. (66.1%) of 2,4- dimethyl-6 hydroxypyrimidine 5 N cyclopentylacetamide, M.P. 300-304 (d.) with softening at 295.

Analysis.-Calcd. for C H N O C, 62.62; H, 7.68; N, 16.86. Found: C, 62.45; H, 7.71; N, 17.15.

(b) 2,4-dimethyl-7 cyclopentylpyrrolo[2,3-d1pyrimidine hydrochloride.A solution .of 5.0 g. (0.02 mole) 2,4-dimethyl 6 hydroxypyrimidine 5 N cyclopentylacetamide in 100 ml. phosphorus oxychloride was refluxed for one hour. Subsequent manipulations were carried out in a manner analogous to Example 6b. In this manner, there was obtained 3.78 g. (75.1%) of 2,4- dimethyl 7 cyclopentylyprrolo[2,3-d] pyrimidine hydrochloride. Recrystallization from ethanol-ether, afforded the analytical sample,,M.P. 220-225 (d.).

Analysis.Calcd. for C H N -HCl: C, 62.00; H, 7.20; N, 16.68; Cl, 14.09. Found: C, 61.90; H, 7.14; N, 16.75; Cl, 14.28.

EXAMPLE 1 8 (a) 2,4 -dimethyl 6 hydroxypyrimidine-5-N-cyclohexylacetamide.-Preparation of the mixed anhydride of 9.1 g. (0.05 mole) 2,4 dimethyl 6 hydroxypyrimidine-S-acetic acid using lisobutyl chloroformate, ad-' dition of 5.45 g. (0.055 mole) cyclohexylamiin'e, and subsequent workup was carried out essentially as described in Example 1b. Recrystallization from dimethylformamide afforded 9.8g. (76%) of 2,4-diniethyl-6-hydroxypyrimidine 5 N-cyclohexylacetamide, M.P. 325-329 (d.) with gradual decomposition from 297".

Analysis.C-alcd. for C H N O t C, 63.85; H, 8.04; N, 15.96. Found: C, 63.55; H, 7.97; N, 16.20.

(b) 2,4 dimethyl 7 cyclohexylpyrrolo[2,3-d]pyrimidine hydrchl0ride.--A solution of 3.46 -g. (0.0132 mole) 2,4-dimethyl-6-hydroxypyrimidine N cyclohexylacetamide in 100 ml. phosphorus oxychloride was refluxed for one hour. Subsequent manipulations were carried out in a manner analogous to Example 6b. In this manner, there was obtained 1.78 g. (50.8%) of 2,4- dimethyl 7 cyclohexylpyrrolo[2,3-d]pyrimidine hydrochloride. Recrystallization trom ethanol-ether followed by sublimation afforded the analytical sample, M.P. 225- 230 (d).

Analysis.-Calcd. for C H N -HCl: C, 63.26; H, 7.59; N, 15.81; Cl, 13.34. Found: C, 63.90; H, 7.85; N, 16.02; Cl, 13.50.

EXAMPLE 19 (a) 2 methyl 4 hydroxypyrimidine-S-N-benzylacetamide.A mixture oat 10.0 g. (0.051 mole) ethyl 2- methyl-4-hydroxypyrimidine 5 acetate, 5.45 g. (0.051 mole) benzylamide, and 5.5 -g. (0.102 mole) sodium methoxide in 100 dry benzene was refluxed for two hours and worked up as described in Example 120. Recrystallization irom ethanol-water afiorded 5.05 g. (38.6% of 2-methyl 4 hydroxypyrimidine-S-N-benzylacetamide, M.P. 229-232.

Analysis.-Calod. for C H N O C, 65.35; H, 5.88; N, 16.33. Found: C, 65.65; H, 5.79; N, 16.63.

(b) 2-methyl-7-benzylpyrrolo[2,3-d]pyrimidine hydrochloride-A solution of 4.25 g. (0.0165 mole) Z-methyl- 6-hydroxypyrimidine-5-N-benzylacetamide in 100 ml. phosphorus oxychloride was refluxed for one hour. Subsequent manipulations were carried out in a manner analogous to Example 6b. In this manner, there was obtained 3.26 g. (73.6%) of 2-methyl-7-ibenzylpyrrolo- [2,3-d1pyrimidine hydrochloride. Recrystallization :Erom isopropanol followed by sublimation afforded the analytical sample, M.P. 229-232" with sweating at 215.

Analysis.Ca1cd. for C H N -I-ICl: C, 64.74; H, 5.43; N, 16.17; Cl, 13.66. Found: C, 65.00; H, 5.57; N, 16.40; Cl, 13.40.

While in the foregoing specification various embodiments of this invention have been set forth in specific detail and elaborated for the purpose of illustration, it will be apparent to those skilled in the art that this invention is susceptible to other embodiments and that many of the details can be varied widely without departing irom the basic concept and the spirit and scope of the invention.

I claim:

1. A member selected from the group consisting of compounds of the formula l CHzC ONHR R N OH wherein R is a member selected from the group eonsist-ing of (lower)alkyl, (lower)alkylthio and -Ar in which Ar is a member selected the group consisting of radicals of the formula 14 and I H- l *1 in which R and R are each members selected from the group consisting of hydrogen, chloro, bnomo, (lower) alkyl, (lower)alkoxy and trifiuoromet-hyl, R is a member selected from the group consisting of hydrogen, (lower)- alkyl and Ar, and R is a member selected [from the group consisting of (lower)alkyl, (l0wer)cycloalkyl containing from 3 to 8 carbon atoms inclusive, (lower) alkenyl, (lower)alkynyl, di(lower)alkylaminoflower) alkyl, piperidino(lower) alkyl, mor-pholino(lower)alkyl, N (lower), N (lower)alkylpiperazinoiflower)alkyl, Ar and (CH ),,Ar wherein n is an integer from one to three inclusive; and the nontoxic, pharunaceutically acceptable acid addition salts thereof.

2. A compound of the -formula C H: C O NHR in which =R R and R each represent (lower)alkyl.

3. A compound of the .fonmula Tomo ONHR in which R and R each represent (lower)alkyl.

4. A compound of the formula in which R R and R each represent (lower)alkyl.

5. 2,4 dimethyl -6 hydroxypyrimidine-S-Nmethylacetamide.

6. 2,4-dimethyl-6-hydi oxypyrimidine-5-N cyclopropylacetamide.

7. 2,4 dimethyl 6 hydroxypyrimidine-5-N-benzylacetamide.

8. 2,4 dimethyl '6 hydroxypy-rimidine-S-N-(B- phenylethyD-acetamide.

9. 2,4 dimethyl 6 hydroxypyrimidine-5-N-[fi-( 1- morpholino ethyl] aeetamide.

10. 2-methyl 4 hyd-roxypyrimidine-5-N-methylacetamide.

11. 2 phenyl 4 hydroxypyrimidine-S-N-methylacetamide.

12. 2 ethylthio 4 hydroxypyrimidine-S-N-methylacetamide.

13. 2 methyl 4 hydroxypyrimidine 5 N phenylacetaimide.

14. 2 ethylthio-4-methyl 6 hyd'mXypyrimidine-S- N-methylacetamide.

15. 2 ethylthio-4-hydroxypyrimidine 5 N-methy1 acetamide.

16. 2,4 dimethyl 6 hydroxypyrimidine-S-Nd-butylacetamide.

(References on following page) 1 References Cited 3y the Applicant FOREIGN PATENTS 4/1959 Great Britain.

OTHER REFERENCES T. B. Johnson and F. Kohmann: Chem. 1., 49, 184- 197 (1931).

Z. Foldi et al.: Ber. 75, 755-763 (1942).

P. Nesbitt and P. Sykes: J. Chem. Son, 3057-3062 (1954).

16 W. T. Caldwell "and W. M. Zieglei': J. Amer; Chem.

Soc. 58, 1749-1751 1935 T.,B. Johnson and c. F. 'Spehz Am. Chem. L, 38,

R. A. West: J. Org. Chem. 26, 4959-4961, (1961).

MAZEL, Primary Examiner.

JOSE TOVAR, Assistant Examiner. 

1. A MEMBER SELECTED FROM THE GROUP CONSISTING OF COMPOUNDS OF THE FORMULA 